High efficiency and high linearity adaptive power amplifier for signals with high papr
AssigneeAviacomm Inc.
InventorsHans Wang, Tao Li, Binglei Zhang, Shih Hsiung Mo
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Abstract
One embodiment of the present invention provides a system for controlling operations of a power amplifier in a wireless transmitter. During operation, the system receives a baseband signal to be transmitted, and dynamically switches an operation mode of the power amplifier between a high power back-off mode having a first power back-off factor and a normal mode having a second power back-off factor based on a level of the baseband signal.
Claims19
A method for controlling operations of a power amplifier in a wireless transmitter, comprising:
- receiving a digital baseband signal;
- in response to determining that a power level of the received digital baseband signal transitions from being equal to or less than a predetermined threshold to being greater than the predetermined threshold, placing the power amplifier in a high power back-off mode having a first power back-off factor;
- and
- in response to determining that the power level of the received digital baseband signal transitions from being greater than the predetermined threshold to being equal to or less than the predetermined threshold, placing the power amplifier in a normal mode having a second power back-off factor, wherein the second power back-off factor is less than the first power back-off factor.
A power amplifier controller for controlling operations of a power amplifier in a wireless transmitter, comprising:
- a receiving mechanism configured to receive a digital baseband signal;
- a power-determination mechanism configured to determine a power level of the received digital baseband signal;
- and
- a control-signal output mechanism configured to:
- in response to the power level transitioning from being equal to or less than a predetermined threshold to being greater than the predetermined threshold, output a control signal to the power amplifier to place the power amplifier in a high power back-off mode having a first power back-off factor;
- and
- in response to the power level transitioning from being greater than the predetermined threshold to being equal to or less than the predetermined threshold, output a control signal to the power amplifier to place the power amplifier in a normal mode having a second power back-off factor, wherein the second power back-off factor is less than the first power back-off factor.
A wireless transmitter, comprising:
- a power amplifier;
- a baseband digital signal processor (DSP);
- a digital-to-analog converter (DAC);
- a modulator;
- and
- a power amplifier controller, wherein the power amplifier controller further comprises:
- a receiving mechanism configured to receive a digital baseband signal;
- a power-determination mechanism configured to determine a power level of the received digital baseband signal;
- and
- a control-signal output mechanism configured to:
- in response to the power level transitioning from being equal to or less than a predetermined threshold to being greater than the predetermined threshold, output a control signal to place the power amplifier in a high power back-off mode having a first power back-off factor;
- and
- in response to the power level transitioning from being greater than the predetermined threshold to being equal to or less than the predetermined threshold, output a control signal to place the power amplifier in a normal mode having a second power back-off factor, wherein the second power back-off factor is less than the first power back-off factor.
Dependencies are inferred from the claim text.